Peter, the GP singles were not very big bikes (about the size of a 250 Ninja), with the final versions being about 210 pounds. Besides, aero bodywork on a bike is usually there to streamline the rider, not the bike, unless of course you are riding something like a Boss Hog.
The Guzzi photos are to give people an idea of what a wind tunnel-developed dustbin looks like.
Note the Guzzi fairing sides are much more rounded, which is supposed to help in cross-winds. At the Isle of Man Vic Willoughby tested a Guzzi single and then Bob McIntyre's DIY dustbin on a Norton and said the latter's "high flat fairing" was much more bothered by cross-winds.
I'd be interested in seeing the riding position too, especially since it is a street bike and rider comfort is a bigger factor than on a racer.
cheers,
Michael